Definition: You are given a question on machine learning. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which image data augmentation is most common for natural images?
(A)random crop and horizontal flip (B)random crop and vertical flip (C)posterization (D)dithering

A